drivers/usb/serial/belkin_sa.c

   1 /*
   2  * Belkin USB Serial Adapter Driver
   3  *
   4  *  Copyright (C) 2000          William Greathouse (wgreathouse@smva.com)
   5  *  Copyright (C) 2000-2001     Greg Kroah-Hartman (greg@kroah.com)
   6  *
   7  *  This program is largely derived from work by the linux-usb group
   8  *  and associated source files.  Please see the usb/serial files for
   9  *  individual credits and copyrights.
  10  *
  11  *      This program is free software; you can redistribute it and/or modify
  12  *      it under the terms of the GNU General Public License as published by
  13  *      the Free Software Foundation; either version 2 of the License, or
  14  *      (at your option) any later version.
  15  *
  16  * See Documentation/usb/usb-serial.txt for more information on using this driver
  17  *
  18  * TODO:
  19  * -- Add true modem contol line query capability.  Currently we track the
  20  *    states reported by the interrupt and the states we request.
  21  * -- Add error reporting back to application for UART error conditions.
  22  *    Just point me at how to implement this and I'll do it. I've put the
  23  *    framework in, but haven't analyzed the "tty_flip" interface yet.
  24  * -- Add support for flush commands
  25  * -- Add everything that is missing :)
  26  *
  27  * 27-Nov-2001 gkh
  28  *      compressed all the differnent device entries into 1.
  29  *
  30  * 30-May-2001 gkh
  31  *      switched from using spinlock to a semaphore, which fixes lots of problems.
  32  *
  33  * 08-Apr-2001 gb
  34  *      - Identify version on module load.
  35  *
  36  * 12-Mar-2001 gkh
  37  *      - Added support for the GoHubs GO-COM232 device which is the same as the
  38  *        Peracom device.
  39  *
  40  * 06-Nov-2000 gkh
  41  *      - Added support for the old Belkin and Peracom devices.
  42  *      - Made the port able to be opened multiple times.
  43  *      - Added some defaults incase the line settings are things these devices
  44  *        can't support.
  45  *
  46  * 18-Oct-2000 William Greathouse
  47  *    Released into the wild (linux-usb-devel)
  48  *
  49  * 17-Oct-2000 William Greathouse
  50  *    Add code to recognize firmware version and set hardware flow control
  51  *    appropriately.  Belkin states that firmware prior to 3.05 does not
  52  *    operate correctly in hardware handshake mode.  I have verified this
  53  *    on firmware 2.05 -- for both RTS and DTR input flow control, the control
  54  *    line is not reset.  The test performed by the Belkin Win* driver is
  55  *    to enable hardware flow control for firmware 2.06 or greater and
  56  *    for 1.00 or prior.  I am only enabling for 2.06 or greater.
  57  *
  58  * 12-Oct-2000 William Greathouse
  59  *    First cut at supporting Belkin USB Serial Adapter F5U103
  60  *    I did not have a copy of the original work to support this
  61  *    adapter, so pardon any stupid mistakes.  All of the information
  62  *    I am using to write this driver was acquired by using a modified
  63  *    UsbSnoop on Windows2000 and from examining the other USB drivers.
  64  */
  65
  66 #include <linux/config.h>
  67 #include <linux/kernel.h>
  68 #include <linux/errno.h>
  69 #include <linux/init.h>
  70 #include <linux/slab.h>
  71 #include <linux/tty.h>
  72 #include <linux/tty_driver.h>
  73 #include <linux/tty_flip.h>
  74 #include <linux/module.h>
  75 #include <linux/spinlock.h>
  76 #include <asm/uaccess.h>
  77 #include <linux/usb.h>
  78 #include "usb-serial.h"
  79 #include "belkin_sa.h"
  80
  81 static int debug;
  82
  83 /*
  84  * Version Information
  85  */
  86 #define DRIVER_VERSION "v1.2"
  87 #define DRIVER_AUTHOR "William Greathouse <wgreathouse@smva.com>"
  88 #define DRIVER_DESC "USB Belkin Serial converter driver"
  89
  90 /* function prototypes for a Belkin USB Serial Adapter F5U103 */
  91 static int  belkin_sa_startup           (struct usb_serial *serial);
  92 static void belkin_sa_shutdown          (struct usb_serial *serial);
  93 static int  belkin_sa_open              (struct usb_serial_port *port, struct file *filp);
  94 static void belkin_sa_close             (struct usb_serial_port *port, struct file *filp);
  95 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs);
  96 static void belkin_sa_set_termios       (struct usb_serial_port *port, struct termios * old);
  97 static int  belkin_sa_ioctl             (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg);
  98 static void belkin_sa_break_ctl         (struct usb_serial_port *port, int break_state );
  99 static int  belkin_sa_tiocmget          (struct usb_serial_port *port, struct file *file);
 100 static int  belkin_sa_tiocmset          (struct usb_serial_port *port, struct file *file, unsigned int set, unsigned int clear);
 101
 102
 103 static struct usb_device_id id_table_combined [] = {
 104         { USB_DEVICE(BELKIN_SA_VID, BELKIN_SA_PID) },
 105         { USB_DEVICE(BELKIN_OLD_VID, BELKIN_OLD_PID) },
 106         { USB_DEVICE(PERACOM_VID, PERACOM_PID) },
 107         { USB_DEVICE(GOHUBS_VID, GOHUBS_PID) },
 108         { USB_DEVICE(GOHUBS_VID, HANDYLINK_PID) },
 109         { USB_DEVICE(BELKIN_DOCKSTATION_VID, BELKIN_DOCKSTATION_PID) },
 110         { }                                                     /* Terminating entry */
 111 };
 112
 113 MODULE_DEVICE_TABLE (usb, id_table_combined);
 114
 115 static struct usb_driver belkin_driver = {
 116         .owner =        THIS_MODULE,
 117         .name =         "belkin",
 118         .probe =        usb_serial_probe,
 119         .disconnect =   usb_serial_disconnect,
 120         .id_table =     id_table_combined,
 121         .no_dynamic_id =        1,
 122 };
 123
 124 /* All of the device info needed for the serial converters */
 125 static struct usb_serial_driver belkin_device = {
 126         .driver = {
 127                 .owner =        THIS_MODULE,
 128                 .name =         "belkin",
 129         },
 130         .description =          "Belkin / Peracom / GoHubs USB Serial Adapter",
 131         .id_table =             id_table_combined,
 132         .num_interrupt_in =     1,
 133         .num_bulk_in =          1,
 134         .num_bulk_out =         1,
 135         .num_ports =            1,
 136         .open =                 belkin_sa_open,
 137         .close =                belkin_sa_close,
 138         .read_int_callback =    belkin_sa_read_int_callback,    /* How we get the status info */
 139         .ioctl =                belkin_sa_ioctl,
 140         .set_termios =          belkin_sa_set_termios,
 141         .break_ctl =            belkin_sa_break_ctl,
 142         .tiocmget =             belkin_sa_tiocmget,
 143         .tiocmset =             belkin_sa_tiocmset,
 144         .attach =               belkin_sa_startup,
 145         .shutdown =             belkin_sa_shutdown,
 146 };
 147
 148
 149 struct belkin_sa_private {
 150         spinlock_t              lock;
 151         unsigned long           control_state;
 152         unsigned char           last_lsr;
 153         unsigned char           last_msr;
 154         int                     bad_flow_control;
 155 };
 156
 157
 158 /*
 159  * ***************************************************************************
 160  * Belkin USB Serial Adapter F5U103 specific driver functions
 161  * ***************************************************************************
 162  */
 163
 164 #define WDR_TIMEOUT 5000 /* default urb timeout */
 165
 166 /* assumes that struct usb_serial *serial is available */
 167 #define BSA_USB_CMD(c,v) usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), \
 168                                             (c), BELKIN_SA_SET_REQUEST_TYPE, \
 169                                             (v), 0, NULL, 0, WDR_TIMEOUT)
 170
 171 /* do some startup allocations not currently performed by usb_serial_probe() */
 172 static int belkin_sa_startup (struct usb_serial *serial)
 173 {
 174         struct usb_device *dev = serial->dev;
 175         struct belkin_sa_private *priv;
 176
 177         /* allocate the private data structure */
 178         priv = kmalloc(sizeof(struct belkin_sa_private), GFP_KERNEL);
 179         if (!priv)
 180                 return (-1); /* error */
 181         /* set initial values for control structures */
 182         spin_lock_init(&priv->lock);
 183         priv->control_state = 0;
 184         priv->last_lsr = 0;
 185         priv->last_msr = 0;
 186         /* see comments at top of file */
 187         priv->bad_flow_control = (le16_to_cpu(dev->descriptor.bcdDevice) <= 0x0206) ? 1 : 0;
 188         info("bcdDevice: %04x, bfc: %d", le16_to_cpu(dev->descriptor.bcdDevice), priv->bad_flow_control);
 189
 190         init_waitqueue_head(&serial->port[0]->write_wait);
 191         usb_set_serial_port_data(serial->port[0], priv);
 192
 193         return (0);
 194 }
 195
 196
 197 static void belkin_sa_shutdown (struct usb_serial *serial)
 198 {
 199         struct belkin_sa_private *priv;
 200         int i;
 201
 202         dbg ("%s", __FUNCTION__);
 203
 204         /* stop reads and writes on all ports */
 205         for (i=0; i < serial->num_ports; ++i) {
 206                 /* My special items, the standard routines free my urbs */
 207                 priv = usb_get_serial_port_data(serial->port[i]);
 208                 kfree(priv);
 209         }
 210 }
 211
 212
 213 static int  belkin_sa_open (struct usb_serial_port *port, struct file *filp)
 214 {
 215         int retval = 0;
 216
 217         dbg("%s port %d", __FUNCTION__, port->number);
 218
 219         /*Start reading from the device*/
 220         /* TODO: Look at possibility of submitting multiple URBs to device to
 221          *       enhance buffering.  Win trace shows 16 initial read URBs.
 222          */
 223         port->read_urb->dev = port->serial->dev;
 224         retval = usb_submit_urb(port->read_urb, GFP_KERNEL);
 225         if (retval) {
 226                 err("usb_submit_urb(read bulk) failed");
 227                 goto exit;
 228         }
 229
 230         port->interrupt_in_urb->dev = port->serial->dev;
 231         retval = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
 232         if (retval) {
 233                 usb_kill_urb(port->read_urb);
 234                 err(" usb_submit_urb(read int) failed");
 235         }
 236
 237 exit:
 238         return retval;
 239 } /* belkin_sa_open */
 240
 241
 242 static void belkin_sa_close (struct usb_serial_port *port, struct file *filp)
 243 {
 244         dbg("%s port %d", __FUNCTION__, port->number);
 245
 246         /* shutdown our bulk reads and writes */
 247         usb_kill_urb(port->write_urb);
 248         usb_kill_urb(port->read_urb);
 249         usb_kill_urb(port->interrupt_in_urb);
 250 } /* belkin_sa_close */
 251
 252
 253 static void belkin_sa_read_int_callback (struct urb *urb, struct pt_regs *regs)
 254 {
 255         struct usb_serial_port *port = (struct usb_serial_port *)urb->context;
 256         struct belkin_sa_private *priv;
 257         unsigned char *data = urb->transfer_buffer;
 258         int retval;
 259         unsigned long flags;
 260
 261         switch (urb->status) {
 262         case 0:
 263                 /* success */
 264                 break;
 265         case -ECONNRESET:
 266         case -ENOENT:
 267         case -ESHUTDOWN:
 268                 /* this urb is terminated, clean up */
 269                 dbg("%s - urb shutting down with status: %d", __FUNCTION__, urb->status);
 270                 return;
 271         default:
 272                 dbg("%s - nonzero urb status received: %d", __FUNCTION__, urb->status);
 273                 goto exit;
 274         }
 275
 276         usb_serial_debug_data(debug, &port->dev, __FUNCTION__, urb->actual_length, data);
 277
 278         /* Handle known interrupt data */
 279         /* ignore data[0] and data[1] */
 280
 281         priv = usb_get_serial_port_data(port);
 282         spin_lock_irqsave(&priv->lock, flags);
 283         priv->last_msr = data[BELKIN_SA_MSR_INDEX];
 284
 285         /* Record Control Line states */
 286         if (priv->last_msr & BELKIN_SA_MSR_DSR)
 287                 priv->control_state |= TIOCM_DSR;
 288         else
 289                 priv->control_state &= ~TIOCM_DSR;
 290
 291         if (priv->last_msr & BELKIN_SA_MSR_CTS)
 292                 priv->control_state |= TIOCM_CTS;
 293         else
 294                 priv->control_state &= ~TIOCM_CTS;
 295
 296         if (priv->last_msr & BELKIN_SA_MSR_RI)
 297                 priv->control_state |= TIOCM_RI;
 298         else
 299                 priv->control_state &= ~TIOCM_RI;
 300
 301         if (priv->last_msr & BELKIN_SA_MSR_CD)
 302                 priv->control_state |= TIOCM_CD;
 303         else
 304                 priv->control_state &= ~TIOCM_CD;
 305
 306         /* Now to report any errors */
 307         priv->last_lsr = data[BELKIN_SA_LSR_INDEX];
 308 #if 0
 309         /*
 310          * fill in the flip buffer here, but I do not know the relation
 311          * to the current/next receive buffer or characters.  I need
 312          * to look in to this before committing any code.
 313          */
 314         if (priv->last_lsr & BELKIN_SA_LSR_ERR) {
 315                 tty = port->tty;
 316                 /* Overrun Error */
 317                 if (priv->last_lsr & BELKIN_SA_LSR_OE) {
 318                 }
 319                 /* Parity Error */
 320                 if (priv->last_lsr & BELKIN_SA_LSR_PE) {
 321                 }
 322                 /* Framing Error */
 323                 if (priv->last_lsr & BELKIN_SA_LSR_FE) {
 324                 }
 325                 /* Break Indicator */
 326                 if (priv->last_lsr & BELKIN_SA_LSR_BI) {
 327                 }
 328         }
 329 #endif
 330         spin_unlock_irqrestore(&priv->lock, flags);
 331 exit:
 332         retval = usb_submit_urb (urb, GFP_ATOMIC);
 333         if (retval)
 334                 err ("%s - usb_submit_urb failed with result %d",
 335                      __FUNCTION__, retval);
 336 }
 337
 338 static void belkin_sa_set_termios (struct usb_serial_port *port, struct termios *old_termios)
 339 {
 340         struct usb_serial *serial = port->serial;
 341         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 342         unsigned int iflag;
 343         unsigned int cflag;
 344         unsigned int old_iflag = 0;
 345         unsigned int old_cflag = 0;
 346         __u16 urb_value = 0; /* Will hold the new flags */
 347         unsigned long flags;
 348         unsigned long control_state;
 349         int bad_flow_control;
 350
 351         if ((!port->tty) || (!port->tty->termios)) {
 352                 dbg ("%s - no tty or termios structure", __FUNCTION__);
 353                 return;
 354         }
 355
 356         iflag = port->tty->termios->c_iflag;
 357         cflag = port->tty->termios->c_cflag;
 358
 359         /* get a local copy of the current port settings */
 360         spin_lock_irqsave(&priv->lock, flags);
 361         control_state = priv->control_state;
 362         bad_flow_control = priv->bad_flow_control;
 363         spin_unlock_irqrestore(&priv->lock, flags);
 364
 365         /* check that they really want us to change something */
 366         if (old_termios) {
 367                 if ((cflag == old_termios->c_cflag) &&
 368                     (RELEVANT_IFLAG(port->tty->termios->c_iflag) == RELEVANT_IFLAG(old_termios->c_iflag))) {
 369                         dbg("%s - nothing to change...", __FUNCTION__);
 370                         return;
 371                 }
 372                 old_iflag = old_termios->c_iflag;
 373                 old_cflag = old_termios->c_cflag;
 374         }
 375
 376         /* Set the baud rate */
 377         if( (cflag&CBAUD) != (old_cflag&CBAUD) ) {
 378                 /* reassert DTR and (maybe) RTS on transition from B0 */
 379                 if( (old_cflag&CBAUD) == B0 ) {
 380                         control_state |= (TIOCM_DTR|TIOCM_RTS);
 381                         if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 1) < 0)
 382                                 err("Set DTR error");
 383                         /* don't set RTS if using hardware flow control */
 384                         if (!(old_cflag&CRTSCTS) )
 385                                 if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 1) < 0)
 386                                         err("Set RTS error");
 387                 }
 388
 389                 switch(cflag & CBAUD) {
 390                         case B0: /* handled below */ break;
 391                         case B300: urb_value = BELKIN_SA_BAUD(300); break;
 392                         case B600: urb_value = BELKIN_SA_BAUD(600); break;
 393                         case B1200: urb_value = BELKIN_SA_BAUD(1200); break;
 394                         case B2400: urb_value = BELKIN_SA_BAUD(2400); break;
 395                         case B4800: urb_value = BELKIN_SA_BAUD(4800); break;
 396                         case B9600: urb_value = BELKIN_SA_BAUD(9600); break;
 397                         case B19200: urb_value = BELKIN_SA_BAUD(19200); break;
 398                         case B38400: urb_value = BELKIN_SA_BAUD(38400); break;
 399                         case B57600: urb_value = BELKIN_SA_BAUD(57600); break;
 400                         case B115200: urb_value = BELKIN_SA_BAUD(115200); break;
 401                         case B230400: urb_value = BELKIN_SA_BAUD(230400); break;
 402                         default: err("BELKIN USB Serial Adapter: unsupported baudrate request, using default of 9600");
 403                                 urb_value = BELKIN_SA_BAUD(9600); break;
 404                 }
 405                 if ((cflag & CBAUD) != B0 ) {
 406                         if (BSA_USB_CMD(BELKIN_SA_SET_BAUDRATE_REQUEST, urb_value) < 0)
 407                                 err("Set baudrate error");
 408                 } else {
 409                         /* Disable flow control */
 410                         if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, BELKIN_SA_FLOW_NONE) < 0)
 411                                 err("Disable flowcontrol error");
 412
 413                         /* Drop RTS and DTR */
 414                         control_state &= ~(TIOCM_DTR | TIOCM_RTS);
 415                         if (BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, 0) < 0)
 416                                 err("DTR LOW error");
 417                         if (BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, 0) < 0)
 418                                 err("RTS LOW error");
 419                 }
 420         }
 421
 422         /* set the parity */
 423         if( (cflag&(PARENB|PARODD)) != (old_cflag&(PARENB|PARODD)) ) {
 424                 if (cflag & PARENB)
 425                         urb_value = (cflag & PARODD) ?  BELKIN_SA_PARITY_ODD : BELKIN_SA_PARITY_EVEN;
 426                 else
 427                         urb_value = BELKIN_SA_PARITY_NONE;
 428                 if (BSA_USB_CMD(BELKIN_SA_SET_PARITY_REQUEST, urb_value) < 0)
 429                         err("Set parity error");
 430         }
 431
 432         /* set the number of data bits */
 433         if( (cflag&CSIZE) != (old_cflag&CSIZE) ) {
 434                 switch (cflag & CSIZE) {
 435                         case CS5: urb_value = BELKIN_SA_DATA_BITS(5); break;
 436                         case CS6: urb_value = BELKIN_SA_DATA_BITS(6); break;
 437                         case CS7: urb_value = BELKIN_SA_DATA_BITS(7); break;
 438                         case CS8: urb_value = BELKIN_SA_DATA_BITS(8); break;
 439                         default: err("CSIZE was not CS5-CS8, using default of 8");
 440                                 urb_value = BELKIN_SA_DATA_BITS(8);
 441                                 break;
 442                 }
 443                 if (BSA_USB_CMD(BELKIN_SA_SET_DATA_BITS_REQUEST, urb_value) < 0)
 444                         err("Set data bits error");
 445         }
 446
 447         /* set the number of stop bits */
 448         if( (cflag&CSTOPB) != (old_cflag&CSTOPB) ) {
 449                 urb_value = (cflag & CSTOPB) ? BELKIN_SA_STOP_BITS(2) : BELKIN_SA_STOP_BITS(1);
 450                 if (BSA_USB_CMD(BELKIN_SA_SET_STOP_BITS_REQUEST, urb_value) < 0)
 451                         err("Set stop bits error");
 452         }
 453
 454         /* Set flow control */
 455         if( (iflag&IXOFF)   != (old_iflag&IXOFF)
 456         ||      (iflag&IXON)    != (old_iflag&IXON)
 457         ||  (cflag&CRTSCTS) != (old_cflag&CRTSCTS) ) {
 458                 urb_value = 0;
 459                 if ((iflag & IXOFF) || (iflag & IXON))
 460                         urb_value |= (BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
 461                 else
 462                         urb_value &= ~(BELKIN_SA_FLOW_OXON | BELKIN_SA_FLOW_IXON);
 463
 464                 if (cflag & CRTSCTS)
 465                         urb_value |=  (BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
 466                 else
 467                         urb_value &= ~(BELKIN_SA_FLOW_OCTS | BELKIN_SA_FLOW_IRTS);
 468
 469                 if (bad_flow_control)
 470                         urb_value &= ~(BELKIN_SA_FLOW_IRTS);
 471
 472                 if (BSA_USB_CMD(BELKIN_SA_SET_FLOW_CTRL_REQUEST, urb_value) < 0)
 473                         err("Set flow control error");
 474         }
 475
 476         /* save off the modified port settings */
 477         spin_lock_irqsave(&priv->lock, flags);
 478         priv->control_state = control_state;
 479         spin_unlock_irqrestore(&priv->lock, flags);
 480 } /* belkin_sa_set_termios */
 481
 482
 483 static void belkin_sa_break_ctl( struct usb_serial_port *port, int break_state )
 484 {
 485         struct usb_serial *serial = port->serial;
 486
 487         if (BSA_USB_CMD(BELKIN_SA_SET_BREAK_REQUEST, break_state ? 1 : 0) < 0)
 488                 err("Set break_ctl %d", break_state);
 489 }
 490
 491
 492 static int belkin_sa_tiocmget (struct usb_serial_port *port, struct file *file)
 493 {
 494         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 495         unsigned long control_state;
 496         unsigned long flags;
 497
 498         dbg("%s", __FUNCTION__);
 499
 500         spin_lock_irqsave(&priv->lock, flags);
 501         control_state = priv->control_state;
 502         spin_unlock_irqrestore(&priv->lock, flags);
 503
 504         return control_state;
 505 }
 506
 507
 508 static int belkin_sa_tiocmset (struct usb_serial_port *port, struct file *file,
 509                                unsigned int set, unsigned int clear)
 510 {
 511         struct usb_serial *serial = port->serial;
 512         struct belkin_sa_private *priv = usb_get_serial_port_data(port);
 513         unsigned long control_state;
 514         unsigned long flags;
 515         int retval;
 516         int rts = 0;
 517         int dtr = 0;
 518
 519         dbg("%s", __FUNCTION__);
 520
 521         spin_lock_irqsave(&priv->lock, flags);
 522         control_state = priv->control_state;
 523
 524         if (set & TIOCM_RTS) {
 525                 control_state |= TIOCM_RTS;
 526                 rts = 1;
 527         }
 528         if (set & TIOCM_DTR) {
 529                 control_state |= TIOCM_DTR;
 530                 dtr = 1;
 531         }
 532         if (clear & TIOCM_RTS) {
 533                 control_state &= ~TIOCM_RTS;
 534                 rts = 0;
 535         }
 536         if (clear & TIOCM_DTR) {
 537                 control_state &= ~TIOCM_DTR;
 538                 dtr = 0;
 539         }
 540
 541         priv->control_state = control_state;
 542         spin_unlock_irqrestore(&priv->lock, flags);
 543
 544         retval = BSA_USB_CMD(BELKIN_SA_SET_RTS_REQUEST, rts);
 545         if (retval < 0) {
 546                 err("Set RTS error %d", retval);
 547                 goto exit;
 548         }
 549
 550         retval = BSA_USB_CMD(BELKIN_SA_SET_DTR_REQUEST, dtr);
 551         if (retval < 0) {
 552                 err("Set DTR error %d", retval);
 553                 goto exit;
 554         }
 555 exit:
 556         return retval;
 557 }
 558
 559
 560 static int belkin_sa_ioctl (struct usb_serial_port *port, struct file * file, unsigned int cmd, unsigned long arg)
 561 {
 562         switch (cmd) {
 563         case TIOCMIWAIT:
 564                 /* wait for any of the 4 modem inputs (DCD,RI,DSR,CTS)*/
 565                 /* TODO */
 566                 return( 0 );
 567
 568         case TIOCGICOUNT:
 569                 /* return count of modemline transitions */
 570                 /* TODO */
 571                 return 0;
 572
 573         default:
 574                 dbg("belkin_sa_ioctl arg not supported - 0x%04x",cmd);
 575                 return(-ENOIOCTLCMD);
 576                 break;
 577         }
 578         return 0;
 579 } /* belkin_sa_ioctl */
 580
 581
 582 static int __init belkin_sa_init (void)
 583 {
 584         int retval;
 585         retval = usb_serial_register(&belkin_device);
 586         if (retval)
 587                 goto failed_usb_serial_register;
 588         retval = usb_register(&belkin_driver);
 589         if (retval)
 590                 goto failed_usb_register;
 591         info(DRIVER_DESC " " DRIVER_VERSION);
 592         return 0;
 593 failed_usb_register:
 594         usb_serial_deregister(&belkin_device);
 595 failed_usb_serial_register:
 596         return retval;
 597 }
 598
 599
 600 static void __exit belkin_sa_exit (void)
 601 {
 602         usb_deregister (&belkin_driver);
 603         usb_serial_deregister (&belkin_device);
 604 }
 605
 606
 607 module_init (belkin_sa_init);
 608 module_exit (belkin_sa_exit);
 609
 610 MODULE_AUTHOR( DRIVER_AUTHOR );
 611 MODULE_DESCRIPTION( DRIVER_DESC );
 612 MODULE_VERSION( DRIVER_VERSION );
 613 MODULE_LICENSE("GPL");
 614
 615 module_param(debug, bool, S_IRUGO | S_IWUSR);
 616 MODULE_PARM_DESC(debug, "Debug enabled or not");